CoMeT: Count-Min-Sketch-based Row Tracking to Mitigate RowHammer at Low Cost

arXiv:2402.18769v1 Announce Type: new
Abstract: We propose a new RowHammer mitigation mechanism, CoMeT, that prevents RowHammer bitflips with low area, performance, and energy costs in DRAM-based systems at very low RowHammer thresholds. The key idea of CoMeT is to use low-cost and scalable hash-based counters to track DRAM row activations. CoMeT uses the Count-Min Sketch technique that maps each DRAM row to a group of counters, as uniquely as possible, using multiple hash functions. When a DRAM row is activated, …

area arxiv bitflips comet cost cs.ar cs.cr dram energy hash idea key low mechanism mitigation performance rowhammer systems the key track tracking